Pulp-strainer.



Patented Nov. 26, l90l.

E. WILSON. PULP STBAINER.

Application filed Eept. 20, 1901.)

(No Model.)

04 ITORNEYS.

NIT'ED STATES PATENT OFFICE.

EUGENE \VILSON, OF BROWNVILLE, NE\V YORK.

PULP-STRAINER.

SPECIFICATION forming part of Letters Patent No. 687,548, dated November 26, 1901.

Application filed September 20. 1901. Serial No. 75,883. (No model.)

To all whom, it may concern:

Be it known that I, EUGENE WILSON, of Brownville, in the county of; Jefferson, in the State of New York, have invented new and useful Improvements in Pulp-Strainers, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

This invention relates to pulp-strainers, having more particular reference to that class in which a suitable vat is employed for receiving the stock of pulp, which vat is provided with a screen bottom wall over which the water is permitted to flow from one end of the vat to the other.

One object of my invention is to provide the strainer with an automatically-actuated device whereby the ordinary screen-rake now in use is dispensed with and the coarse stock and slivers are prevented from accumulating upon the screen-plates and wherebya greater quantity of stock is forced through the screen with less water, and consequently with less power, from the pumps.

Afurther object is to prevent the accumulation of slime under the screen-plates; and

a still further object is to provide means in proximity to the water-inlet opening for breaking the force of the current across the screen.

To this end the invention consists in the combination, construction, and arrangement of the parts of my invention, as hereinafter f ully described, and pointed out in the claims.

Referring to the drawings, Figure 1 is a top plan view of a pulp-strainer embodying my invention. Figs. 2 and 3 are sectional views taken, respectively, on lines 2 2 :and 3 3 of Fig. 1. Fig. 4 is a perspective view of the detached rotary dam. Fig. 5 is a perspective view of the detached snub-block.

Similar reference characters indicate corresponding parts in all the views.

In the drawings I have shown a pulpstrainer consisting of a vat 1, a rotary dam or agitator 2, and a snub-block or baffle-plate 3. The vat 1 may be of any desired form or size or construction provided with a perforated bottom wall 4 and inlet-openings 5 anda discharge conduit or trough 6. The dam or agitator 2 may also be any desired form or size adapted to be rotated by the current of the water or stock passing from the inletopening 5 to the outlet 6. This rotary dam or agitator is supported within the vat between the inlet and outlet openings in proximity to the bottom wall 4 and preferably consistsof a series of blades or plates mounted upon trunnions 7, which are journaled in suitable brackets 8, secured to the side walls of the vat. The bearings for receiving the trunnions are preferably open at one side for permitting the insertion and removal of the agitator 2 when desired. As seen in the drawings, this agitator is supported substantially midway between the inlet and outlet openings, although it is evident that the exact posi tion relativeto said openings is immaterial, the essential requirements being that it be supported in proximity to the screen bottom wall 4, between the inlet and outlet openings 5 and 6, so that as the water flows over the screen from the inlet to the outlet opening the agitator will be automatically rotated thereby, thus obviating the necessity for screen-rakes to prevent the accumulation of slivers, coarse stock, &c., upon the plates, which interfere with the straining of the pulp.

It is evident that as the water flows over the screen from the inlet to the outlet openings the water impinges against the lower blades beneath the axis of the agitator, thereby rotating the agitator in the direction indicated by the arrow 10, thus continuously prosenting the several blades in the path of the moving water, and thereby checking therapidity of the current across the screen and permitting the suction-pumps (not illustrated) to act with greater efficiency upon the pulp for drawing the same through the screen. This rotation of the agitator serves to distribute the pulp more uniformly over the surface of the screen and on account of its simplicity and automatic action by the current affords an economical means for reducing the rapidity of the flow of the current from the inlet to the outlet openings across the screens and at the same time serves to distribute the pulp over the surface of the screen and prevents the accumulation of any coarse stock or sediment upon the screenplates, which would interfere with the efficient straining of the pulp.

It is desirable that the force of the current from the inlet-opening be somewhat impeded before reaching the rotary agitator 2, and I therefore provide the snub-block or baftleplate 3, which may be of any desired form or material and is adapted to be supported in the vat in proximity to the bottom screenwall 4 between the inlet-opening 5 and agitator 2. This snub-block or baffle-plate is removably supported in suitable slots or ways 11, formed in the side walls of the vat in proximity to the inlet-opening 5, the intermediate portion of the lower edge of the said baffle-plate' being cut away for forming a water-passage between the screen and lower edge of the plate, it being understood that this opening is sufficient to permit the water to pass along the upper face of the screen to the agitator 2 for actuating said agitator and yet is arranged in such proximity to the screen-plate as to break the force of the current passing through the inlet-opening 5.

Although I have shown a specific form of pulp-strainer, it is evident that my invention, which consists, essentially, of a rotary dam or agitator and a snub-block or baffle-plate, may be employed in connection with any form of strainer having a screen bottom wall and suitable inlet and outlet openings, the bafifleplate being interposed between the inlet-opening and the agitator, which is rotated automatically by the current of water passing over the screen.

The operation of my invention will now be readily understood upon reference to the foregoing description and the accompanying drawings, and it will be noted that the forms of the rotary agitator and snub-block may be somewhat varied without departing from the spirit of this invention.

Having described my invention, what I claim, and desire to secure by Letters Patent, 1s

1. In a pulp-strainer, a vat having a screenbottom and inlet and discharge openings, and a rotary dam above the screen and between the openings and a snub-bar abovethe screen in proximity to the inlet-opening for the purpose specified.

2. Ina pulp-strainer, a vat having a screenbottom and inlet and discharge openings, and a rotary dam above the screen and between the openings and a snub-bar between the dam and inlet. p

3. In apulp-strainer a vat having a screenbottom and inlet and discharge openings, and a rotary dam supported in the vat and actuated' by the flow of the stock and a snubblock between the dam and inlet to break the force of the current from the inlet.

4. In a pulp-strainer, a vat having a screenbottom and inlet and outlet openings at its opposite ends, a rotary (lam between the openings and actuated by the current, and a snub bar between the dam and inlet for the purpose described.

In witness whereof I have hereunto set my hand on this 10th day of September, 1901.

EUGENE WILSON.

Witnesses:

O. F. DANo, G. H. MOKAM. 

